Louver or vane rail punching or stamping machine



July 14, 1970 o. c. WILSON, JR 3,520,170

LOUVER OR VANE RAIL PUNCHING OR STAMPING MACHINE Filed Jan. 26, 1967 4Sheets-Sheet W FIG. 5.

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LOUVER OR VANE RAIL PUNCHING OR STAMPING MAL LZlNE Filed Jan. 26, 1967 4Sheets-$heet 5 O. C. W/ASOMc/Q Maw aha 4w mwx/ y 14, 1970 0. 0. WILSON,JR 3,520,170

LOUVER OR VANE RAIL PUNCHING OR S'L'AVU 'ING MACIHNH Filed Jan. 26,196'? 4 Sheets-Shoot 4 LIL/ 35 I 7g 32 //v ////K H -J a 4/ l f 5 7//////////f INVENTOR. o. a. au/zso/v, (/2.

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United States Patent 3,520,170 LOUVER OR VANE RAIL PUNCHING OR STAMPINGMACHINE O. C. Wilson, Jr., Shreveport, La., assignor of one-half toDwight M. Brown, Taylor W. OHearn, and Dwight M. Brown, Jr., all ofCaddo Parish, La.

Filed Jan. 26, 1967, Ser. No. 612,007 Int. Cl. B21d 22/00, 31/02, 37/04,37/06 US. Cl. 72325 Claims ABSTRACT OF THE DISCLOSURE A machine forsimultaneously stamping or punching slotted buttons in sheet metal, asused for attaching airdeflecting vanes or vane rails in air duct turnsand attaching louver blades to louvers, the device consisting of asupport containing a frame structure comprising ahorizontally-adjustable sheet metal-receiving work table with ahorizontal top plate fixedly-mounted above the work table and providedwith an adjustable vertical spindle carrying a bar having a pair offemale dies facing downwardly, with means for locking the bar inadjusted rotated position. Another horizontal plate is provided beneaththe work table and below this plate is another vertically-movable platecarrying a shouldered member supporting a plurality ofvertically-movable dies slidably engaging through apertures provided inthe horizontal plate thereabove and being in registry with the femaledies. Treadle-operated means consisting of a verticallymovable plungerreciprocates the upstanding male dies vertically to co-act with thefemale dies. The upwardlymovable member driving the male dies upwardlyalso carries a guide punch element which indents the sheet metalworkpiece. An upstanding guide pin is engageable in the indentation inthe next punching and stamping operation to correctly position theworkpiece. The dies are formed to create upwardly-stamped buttons andthe dies have means to shear the buttons diametrically so as to formslots therein. The dies are adjustable to vary the angle of the slotsacross the buttons.

This invention relates to stamping and punching machines, and moreparticularly to a machine for punching slotted buttons in sheet metal asused for attaching turning vanes or vane rails in air duct turns and forattaching louver blades to louvers.

A main object of the invention is to provide a novel and improved sheetmetal stamping and punching machine for forming slotted buttons inpieces of sheet metal to be employed in ducts, the buttons being usedfor attaching vanes or louver blades to the sheet metal pieces, themachine being relatively simple in construction, being easy to operate,and providing accurate repetitive fabrication of the desired slottedbuttons therein.

A further object of the invention is to provide an improved machine forpunching slotted buttons in sheet metal, as used in air ducts and thelike, the machine being relatively inexpensive to manufacture, beingdurable in construction, being adjustable so as to change the locationsof the slotted buttons relative to the sheet metal pieces furnished tothe machine, as desired, and in accordance with desired locations forfastening vanes or louver blades thereto, and the machine enabling thedesired slotted buttons to be quickly and accurately formed with aminimum amount of labor and in an economical manner.

Further objects and advantages of the invention will become apparentfrom the following description and claims, and from the accompanyingdrawings, wherein:

FIG. 1 is a fragmentary top plan view of an improved "ice slotted buttonstamping and punching machine constructed in accordance with the presentinvention.

FIG. 2 is a side elevational view, partly broken away, of the machineillustrated in FIG. 1.

FIG. 3 is a horizontal cross-sectional view taken substantially on theline 33 of FIG. 2.

FIG. 4 is a vertical cross-sectional view taken substantially on theline 4-4 of FIG. 1.

FIG. 5 is a horizontal cross-sectional view, looking upwardly, takensubstantially on the line 5-5 of FIG. '2.

FIG. 6 is a horizontal cross-sectional view taken substantially on theline 6-6 of FIG. 2.

FIG. 7 is a vertical cross-sectional view taken substantially on theline 7-7 of FIG. 1.

FIG. 8 is an enlarged fragmentary vertical cross-sectional detail viewtaken substantially on the line 8-8 of FIG. 2.

FIG. 9 is a diagrammatic plan view showing a corner turn in an air ductand illustrating in plan view a bottom anchoring plate for receiving thebottom edges of a plurality of curved air-guide plates employed in thecorner bend to guide air around the corner of the duct, the anchoringplate being provided with slotted buttons formed by the machineillustrated in FIGS. 1 to 8.

FIG. 10 is a fragmentary plan view of another anchoring plate formedwith slotted buttons by the use of the machine of FIGS. 1 to 8, with theslotted buttons having slots in alignment and oriented to receive andsupport the edges of parallel louvers.

FIG. 11 is an enlarged fragmentary vertical cross-sectional view,generally similar to FIG. 4, and showing an intermediate stage of theworking cycle of the machine wherein the male dies are about to engagewith the workpiece, the workpiece being clamped against the female dies.

FIG. 12 is a vertical cross-sectional view, similar to FIG. 11, butshowing the positions of the male dies after they have penetrated andformed the slotted buttons in the workpiece and showing the cooperationof the male dies with the female dies in the slotted buttons.

FIG. 13 is an enlarged fragmentary vertical cross-sectional view andsubstantially on the line 1313 of FIG. 3.

FIG. 14 is a vertical cross-sectional view taken substantia'lly on line1414 of FIG. 13.

Referring to the drawings, 14 generally designates an improved devicefor punching slotted buttons in sheet metal constructed in accordancewith the present invention. The device 14 comprises a main supportingplate 15 formed with a depending central cylindrical sleeve portion 16which is rotatably-received in a vertical cylindrical sleeve-likebushing 17 which is, in turn, supported on a plurality ofdownwardly-divergent legs 18 secured at their bottom ends to therespective corners of a rectangular base frame 19, the top ends of thelegs 18 being rigidly-secured, as by welding or the like, to thesleeve-like bushings 17.

The sleeve 17 is provided with a set screw 20' which may be tightened tolock the inner sleeve 16 and the main supporting plate 15 in an adjustedrotated position relative to the outer sleeve 17.

A vertical plunger or ram member 21 extends slidably through and isvertically-supported by the inner sleeve 16. The bottom end of plungermember 21 is pivotallyconnected at 22 to the top end of a coupling bar23. The bar 23 has a reduced threaded bottom stud portion 24 which isthreadedly-engaged in a clevis member 25 whose lower end ispivotally-conneeted at 26 to the end of a foot lever 27 which is pivotedat 28 to the base frame 19, the connection at 28 being made by atransverse rod which is secured at its ends in opposite sides of thebase frame. Thus, the shorter arm of lever 27 is connected at 26 to theclevis member 25, and the longer arm extends outw ardly and is providedat its outer end with a foot pedal pad 29 engageable by the operatorsfoot, whereby downward pressure on the pad 29 rotates the lever 27 in aclockwise direction, as viewed in FIG. 2, forcing the ram or plungermember 21 upwardly. The top end of the plunger member 21 is reduced, asshown at 30, and engages in a central aperture 31 of a horizontal platemember 32, the reduced portion defining an annular shoulder 33 facingupwardly and which can be used to exert upward force on the plate member32. Thus, plate member 32 is elevated responsive to the downwardmovement of the lever pad 29, as above-described.

Designated at 34 is another plate member disposed above the plate member32 and resiliently-supported on four coiled springs 35 provided at therespective corners of the assembly. Thus, the plate members 15, 32 and34 are rectangular in shape and are of similar size. Secured to therespective corners of the main supporting plate 15 are upstanding postmembers 36, and secured to the top ends of the post members 36 is anadditional rectangular plate member 37, similar in size and shape to thepreviously-described plate members 34, 32 and 15. As shown in FIG. 8,the top: plate 37 may be secured on the top ends of the post members 36by respective fastening screws 38 engaged through the corners of the topplate 37 and threadedly-engaged in the top end portions of the postmembers 36. The post members 36 extend slidably through respectivecorner apertures 39 and 40 formed in the plate members 32 and 34, thelower ends of the post members 36 being enlarged, as shown at 41 so asto support the plate member 32 in vertically-spaced relationship to themain supporting plate 15, as is clearly shown in FIG. 8. The lower endsof the post members 36 may be secured to the main supporting plate 15 bymeans of fastening bolts 42, as shown in FIG. 8. The springs 35 surroundthe post members 36 between the plates 32 and 34, therebyresiliently-supporting the plate 34 in the manner clearly illustrated inFIG. 8.

Plate 34 is secured in an adjusted vertical spacing with respect toplate 32 by the provision of a pair of beaded stop bolts 43 and 44 (seeFIGS. 4 and 6) located in the longitudinal central plane of the deviceand symmetrically-disposed on opposite sides of its center line. Thebolt 43 engages upwardly through plate 32 and is threadedly-engaged inplate 34, being locked in position by the provision of a lock nut 45tightened against the bottom surface of plate 34, as shown in FIG. 4.Similarly, the

bolt 44 engages upwardly through the plate 32 and is K locked to theplate 34 by the provision of upper and lower lock nuts 46 and 47provided on bolt 44 and engaging the upper and lower surfaces of plate34. Thus, the stop bolts 43 and 44 have head portions bearing beneathplate 32, thereby limiting the upward movement of plate 34 with respectto plate 32.

The upper plate 37 is formed with a central aperture 48 which is coaxialwith plunger member 21. Rotatablyengaged in the aperture 48 is avertical sleeve member 49 formed integrally at its bottom end with ahorizontal bar member 50 provided at its opposite ends with thedownwardly-facing female button dies 51, 51. The dies 51, 51 are locatedat equal radial distances from the axis of sleeve member 49. Ahorizontal arm 52 is secured to the top portion of the sleeve element49, the arm 52 being slidably-supported on the top plate 37. Thus, arm

52 may be provided with an aperture 53 at one end' portion thereofreceiving the top portion of sleeve member 49, the end portion of arm 52being further provided with a set screw 54 which lockingly-engages thesleeve portion 49, as illustrated in FIGS. 11 and 12. Arm 52 is thusrigidly-connected to the die bar 50, and the position of said die bar isadjusted by correspondinglyadjusting the rotated position of the arm 52.For this purpose, the top plate 37 is formed with a plurality of detentrecesses 53 located at equal radial distances from the vertical axis ofrotation of sleeve element 49, said recesses being adapted toselectively-receive the depending pin element 54 provided at the bottomend of a vertical arm 55 integrally-formed on a lever bar 56 pivoted at57 between a pair of upstanding parallel lugs 58, 58 formed on the outerend portion of arm 52. The lever bar 56 has the upwardly andinwardly-inclined inner arm portion 59 which is pivotally-connected at60 to the top end of a vertical plunger 61 slidably-engaged in thesleeve member 49 and biased upwardly by a coiled spring 62 surroundingthev upper portion of the plunger 61 and bearing between the top rim ofsleeve element 49 and the under surface of arm portion 59, therebybiasing lever arm 56 in a counterclockwise direction, as viewed in FIG.4. A stop ring 63 is provided on the lower end of plunger 61 to limitupward movement of the plunger substantially to the position thereofshown in FIG. 4, wherein the pin 54 is engageable in a selected lockingrecess 53. A knob 65 is provided on the innermost end portion of armelement 59 for exerting manual downward force on the plunger 61 againstthe biasing force of spring 62. When such downward force is exerted onknob 65 the pin 54 is elevated from one recess 53, enabling the arm 52and die bar 50 to be rotated to another adjusted position thereofwherein pin element 54 may engage in a corresponding detent recess 53.

As shown in FIG. 1, a suitable number of recesses 53 may be provided,corresponding to desired positions of orientation of the female dies51,51. In the typical embodiment illustrated, three recesses 53 areprovided, said recesses being spaced apart by respective angles of 45with theintermediate recess located in a transverse vertical plane.

Plate member 34 is formed with a plurality of sets ofdiametrically-opposed male die apertures 66, 66 located in verticalregistry with the various positions of the pairs of female dies 51, 51established by the settings of pin 54 in the various detent recesses 53.Respective male die assemblies 67 are provided at these variouspositions, each die assembly comprising a cylindrical lower block 68 onwhich is adjustably-secured a cylindrical upper block 69, each upperblock 69 having a depending central stud portion 70 which is received inthe correspondingly-shaped recess centrally-located in the subjacentcylindrical block 68 and locked in adjusted position relative to thelower block by a set screw 71 provided in said lower cylindrical block,as shown in FIG. 11. The upper and lower blocks 69 and 68 are ofidentical diameters so that their adjoining surfaces are flush with eachother. The top end of each upper block 69 is formed with a reducedupwardly-projecting male die element 72, including an upstandingdiametrically-extending slot-forming rib 73, the upstanding buttonelement 72 and associated slot-forming rib 73 being receivable inrespective cup-shaped recesses 74 provided in the female dies 51, as isclearly shown in FIGURE 13, so that slotted buttons are formed in asheet metal workpiece 75 acted on by the cooperating male and femaledies 67 and 51.

The male die assemblies 67 are slidably-receivable through the apertures66 in plate 34, as shown in FIGS. 4, l1 and 12. The lower blocks 68 ofthe male die assemblies are provided with pairs of depending parallelvertical positioning pin elements 75', 75 which are slidably-received inassociated pairs of vertical bores 76 provided in the plate member 32,which hold the blocks 68 against rotation. The lower ends of the pairsof pins 75' are engageable with the bottom plate 15, for example, whenthe machine is in the normal rest position thereof shown in FIG. 4,wherein the die assemblies 67 are supported with their top ends locatedbelow the horizontal plane of the apertured plate member 34, as shown.

As shown in FIG. 11, the upper die elements 69 are provided withshoulder portions 86 which limit the depth punched by the dies. Theangle of the slot formed in the punched button is predetermined byadjustment of the upper die block 69 with respect to the associatedbottom die block 68, the blocks being secured in adjusted positions bymeans of their associated set screws 71, as above-described.

The top end of the plunger member 21 has a reduced portion 30, asabove-mentioned, and the reduced portion is centrally-formed with apilot bore or recess 87 which rotatably-receives the depending studelement 88 of a horizontally-extending die-supporting bar 89, saidsupporting bar 89 being provided with the central upstanding postelement 90. The top end of post element 90 is formed with a transversegroove 91 adapted to receive the depending diametrically-extending ribportion 92 provided on the bottom end of the plunger member 61, wherebypost member 90 may be, at times, keyed to plunger member 61 for thepurpose of rotating the diesupporting bar 89 into a positionsupportingly-engaged beneath a pair of selected male die assemblies 67in the manner illustrated in FIGS. 4, l1 and 12. The selection of themale die assemblies to be used is performed with the machine in theposition of FIG. 4, namely, without the presence of a sheet metalworkpiece 75 therein. Under these conditions the male die assemblies aresupported by the engagement of their associated pairs of pins 75 withthe bottom plate 15. Plate 32 is in a relatively lowered positionwherein the die bar 89 is below the plane of the bottom surfaces of thedie blocks 68. Under these conditions, the plunger member 61 isdepressed by exerting downward force on the knob 65 to engage the key 92in the groove 91, which allows the die bar 89 to be rotated by rotatingthe arm 52. This rotates the die bar 89 along with the female die arm toplace the die bar 89 beneath the pair of male die assemblies '67corresponding to the desired orientation of a pair of slotted buttons tobe formed in a workpiece. Thus, with key 92 engaged in groove 91 thefemale die bar 50 is in registry with the male die-supporting bar 89.The supporting die bar 89 maintains the selected male die assemblies 67in a position sufficiently elevated so that they can cooperate with thefemale dies 51, 51 when the plates 32 and 34 are elevated by exertingdownward force on the treadle pad 29, as will be presently described.Under these conditions, the non-selected male dies remain in relativelylowered positions so that their top ends cannot be elevated above thelevel of the top plane of plate member 34 when plate member 32 iselevated during the working stroke of the machine.

As will be readily apparent, the male die assemblies 67 which are notsupported by the bar member 89 will drop to inoperative positionswherein their top ends will always remain below the plane of the topsurface of plate member 34. It will also be understood that the angle ofthe slot across the button formed by each male die assembly ispredetermined by the setting of the 11pper portion 69 of the male dieassemblies 67, each up per male die portion 69 being locked in adjustedposition by its associated set screw 71.

An upstanding guide punch 93 of upwardly-convergent or conical shape ismounted on the plate member 34 and cooperates with a similarly locatedfemale die unit 94 on the uppermost plate member 37 to form a guidedimple in a strip of sheet metal being punched which is engageable overan upstanding registration pin 95 to properly space the slotted buttonsformed at the next operation on the strip of sheet metal. The upstandingguide pin 95 is mounted on an adjustable bar member 96slidably-supported between a pair of parallel guide rails 97, 97extending in the direction of longitudinal feed of the workpiece. Theguide rails 97, 97 are formed integrally on a plate member 99 projectingforwardly from and rigidly-connected to the front edge of plate member34. Any suitable locking means may be provided for the adjustablework-positioning bar element 96. For example, the bar element may beprovided with a depending stud 100 extending through a longitudinal slot101 formed in plate member 99 and provided at its bottom end with a wingnut 102 for locking the bar member 96 in longitudinally-adjustedposition between the guide rails 97, 97.

As will be apparent, the setting of the bar member 96 and its guide pin95 determines the spacing between successive sets of punched slottedbuttons formed in a strip of metal fed longitudinally, namely,downwardly, as viewed in FIGS. 1, on the plate member 34. Said platemember is provided with a longitudinally-extending fence rail 104 whichis adjustable transversely and whose posi tion is determined by theadjustment of a transverselyextending screw 106 provided at its outerend with an operating handle 105 and rotatably-secured at its inner endto the intermediate portion of the fence bar 104. The screw 106 isthreadedly-engaged through an upstanding bar member 107 secured to theleft side edge of plate member 34, as viewed in FIGS. 3 and 4. A locknut 108 is provided on screw 106 for locking the screw to the fence bar104 after an adjustment has been made. With the nut 108 loosened, theposition of the fence bar 104 may be adjusted by rotating the handle105.

Handle 105 may be rigidly-secured to the screw 106 in any suitablemanner, for example, by the provision of a locking nut 109 on the outerend of the screw member 106.

Rigidly-secured to the outer portions of the fence bar 104 arerespective guide blocks 110, 111 which respectively slidably-engage theopposite transverse edges of the plate member 34 and act as guide meansfor maintaining the fence bar 104 in longitudinal alignment ghile it isbeing adjusted transversely on plate mem- In operation, a pair of dieassemblies 67 is selected in the manner above-described, namely, bydepressing the plunger member 61 by means of lever 56 while the platemember 32 is in its lowered position, such as that shown in FIG. 4, toengage key 92 in groove 91, after which lever 56 is rotated to theposition corresponding to the desired pair of male die assemblies 67 tobe used, after which lever 56 is released to allow the pin 54 tolockingly-engage in the corresponding selected aperture 53. Thisposition bar 89 beneath the selected pair of male die assemblies, asabove-described. It also suitably orients the bar 50 carrying the femaledies 51 at the same angular position as the bar 89, namely, with thefemale dies 51 in vertical registry with the selected male die assembily67. The fence bar 104 is adjusted to the position corresponding to thatproviding the proper spacing of the punched slotted buttons from theleft edge of the strip of sheet metal on which the buttons are to beformed, as viewed in FIG. 2. The strip of sheet metal 75 is then placedbetween the plate members 34 and 37 with its longitudinal edge engagedagainst the fence bar 104 and a first set of slotted buttons are stampedtherein by stepping on the treadle pad 29 to move plate members 32 and34 upwardly, first to the position shown in FIG. 11 wherein the platemember 34 and the workpiece 75 engage the female dies 51 and thensubsequently to the position of FIG. 12 wherein the selected male diesare forced upwardly against the compressive resistance of the springs 35to cause male die elements 72 and ribs 73 to form the slotted buttons inthe female die recesses.

It will be noted that in accordance with the foregoing description, theplate member 15 constitutes the main horizontal support of the machine,and the post elements 36 constitute vertically-extending guide meansrigidlyconnecting the top plate 37 to the main supporting plate 15, withthe work-receiving table member 34 slidably-enga'ged on the aforesaidvertical guide means. The plate member 32 constitutes avertically-movable drive means located between the table member 34 andthe main bottom support 15, the drive plate 32 acting through the bar 89on the selected male die assemblies 67, 67.

FIG. 9 shows a corner turn 115 in an air duct employing a bottomanchoring plate 75 formed with slotted buttons 112 receiving the bottomedges of a plurality of arcuately-curved air-guide plates 114, thebuttons 112 being formed in the plate 75 by the device 14 substantiallyin the manner above-described.

FIG. 10 shows another bottom anchoring plate 75 formed with slottedbuttons 112 arranged to receive and support the bottom edges ofdiagonally-directed parallel ilouvers 116, said buttons being formed inplate 75 by the device 14 also following a procedure substantially asabove-described.

As will be readily apparent, the relationship of the male and femaledies may be reversed, if so desired, namely, the dies may be constructedso that the female elements thereof are moved upwardly toward thefixedly-mounted male elements to provide the same results as areobtained with the specific structural arrangement illustrated in thedrawings.

While a specific embodiment of an improved machine for forming slottedbuttons in sheet metal has been disclosed in the foregoing description,it will be understood that various modifications within the spirit ofthe invention may occur to those skilled in the art. Therefore, it isintended that no limitations be placed on the invention ex cept asdefined by the scope of the appended claims.

What is claimed is:

1. A machine for forming slotted buttons in sheet metal comprising amain horizontal support, a top plate over said support, vertical guidemeans rigidly-connecting said top plate in vertically-spaced relation tosaid support movable work-receiving table means between said top plateand support and slidably-engaged with said vertical guide means, drivemeans between said table means and said support, a plurality of spacedupwardly vertically-extending first die means on said drive meansarranged at equal radial distances from a common center, said tablemeans being formed with apertures slidably-receiving and guiding saidfirst die means, a die-support element rotatably-mounted in said topplate on an axis extending through said common center, downwardly-facingsecond die means on the in said top plate on an axis extending throughsaid common center, downwardly-facing second die means on thedie-supporting element located so as to be vertically-registrable with aselected one of said first die means and so as to face the selected oneof the upwardly-extending first die means, means to elevate said drivemeans to bring the selected first and second die means together inworkforming cooperation, one of said die means including a projectionhaving a diametrical transverse rib and the other of said die meansbeing provided with a recess formed to closely-receive said projection.

2. The forming machine of claim 1, and means to rotatablly-adjust saidprojection relative to said one of the die means, said recess in theother die means being formed to receive the transverse rib in aplurality of positions of angular adjustment of the projection.

3. The forming machine of claim 1, and wherein said vertically-movabledrive means is slidably-engaged with 0 and held against rotation by saidvertical guide means.

4. The forming machine of claim 3, and wherein said apertures arecircularly-arranged around said axis, said first die means comprisingmale die elements each in registry with and receivable in one of saidapertures, said second die means comprising a bar memberrotatablyconnected to said top plate at said common axis and formed withdownwardly-facing female die elements.

5. The forming machine of claim 4, and wherein said male die elementsare normally supported on said drive means, during a driving stroke,below their operative positions, and movable block means on said drivemeans engageable below selected male die elements to elevate them tooperative positions.

6. The forming machine of claim 5, and wherein said block means extendstransversely and is in vertical registry with said bar member.

7. The forming machine of claim 6, and means to at timesdrivingly-couple said bar member to said block means for simultaneousrotational adjustment, and cooperating locking means on the bar memberand top plate for locking said bar member in adjusted position.

8. The forming machine of claim 7, and wherein said male die elementsare provided with depending vertical pin means extending slidablythrough said drive means and being supportingly-engageable with saidmain horizontal support.

9. The forming machine of claim 7, and wherein said block means isprovided with an upstanding central vertical post element at said commonaxis and said coupling means comprises cooperating key-and-groove meansin the post element and bar member.

10. The forming machine of claim 9, and an upstanding male guide dieelement on said table member and a downwardly-facing female die elementon said top plate over said guide die element to form a positioningdimple in a workpiece, and an upstanding guide pin element on the tablemember located forwardly of and in longitudinal alignment with the maleguide die element in the direction of feed, said upstanding guide pinelement being shaped to engage in a dimple formed by said male guide dieelement and the last-named female die elements.

References Cited UNITED STATES PATENTS 607,442 7/1898 Landtved 723501,192,066 7/1916 Jaffe 72358 1,519,552 12/1924 Rigby 72351 1,772,9148/1930 Rode 72358 2,251,433 8/1941 Wareham 72358 2,312,749 3/1943Bullock 72-327 2,887,157 5/1959 Rehdorf 72327 3,080,839 3/1963 Fein etal. 72354 3,135,045 6/1964 Schane 72412 3,108,558 10/1963 Galvin 29-513XR CHARLES W. LANHAM, Primary Examiner E. M. COMES, Assistant ExaminerUS. Cl. X.R. 72358, 472

